/* roulang page: index */
:root {
      --bg-main: #F8F9FA;
      --bg-white: #FFFFFF;
      --bg-dark: #0D1117;
      --bg-dark-card: #161B22;
      --primary: #12151A;
      --primary-light: #2A303C;
      --accent: #E06A26;
      --accent-hover: #C8591A;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-light: #9CA3AF;
      --border-light: rgba(0, 0, 0, 0.08);
      --border-dark: #21262D;
      --radius: 6px;
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      --font-stack: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select {
      font-family: inherit;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* Top Bar */
    .top-bar {
      background-color: #EEF1F4;
      font-size: 12px;
      color: var(--text-muted);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      padding: 6px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-left span {
      margin-right: 20px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .top-bar-right {
      display: flex;
      gap: 16px;
    }
    .top-bar-right a:hover {
      color: var(--accent);
    }

    /* Sticky Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .brand-logo svg {
      width: 28px;
      height: 28px;
      fill: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 24px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent);
      transition: var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--accent);
      color: #FFF;
      padding: 10px 22px;
      border-radius: var(--radius);
      font-size: 14px;
      font-weight: 600;
      border: 1px solid var(--accent);
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-cta:hover {
      background-color: var(--accent-hover);
      border-color: var(--accent-hover);
      color: #FFF;
      transform: translateY(-1px);
    }
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: transparent;
      color: var(--primary);
      padding: 10px 22px;
      border-radius: var(--radius);
      font-size: 14px;
      font-weight: 600;
      border: 1px solid var(--border-light);
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background-color: #F1F3F5;
      border-color: #D1D5DB;
    }

    /* Mobile Menu Toggle */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background-color: var(--primary);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* Section Utility */
    .section-wrap {
      padding: 96px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #F9FAFB;
      border-bottom: 1px solid var(--border-dark);
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-header {
      max-width: 820px;
      margin: 0 auto 56px auto;
      text-align: center;
    }
    .badge-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      color: var(--accent);
      background-color: rgba(224, 106, 38, 0.1);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .badge-tag-dark {
      background-color: rgba(224, 106, 38, 0.2);
    }
    .section-title {
      font-size: 34px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .section-dark .section-desc {
      color: var(--text-light);
    }

    /* Hero Section (Campaign & Bento Structure) */
    .hero-section {
      background-color: var(--bg-white);
      padding: 60px 0 90px 0;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-light);
    }
    .flash-notice-bar {
      background-color: #FFF7ED;
      border: 1px solid #FFEDD5;
      padding: 10px 16px;
      border-radius: var(--radius);
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 40px;
      font-size: 13px;
      color: #9A3412;
    }
    .flash-timer {
      font-family: monospace;
      font-weight: 700;
      background: #EA580C;
      color: #FFF;
      padding: 2px 8px;
      border-radius: 4px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 50px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--primary);
      letter-spacing: -0.8px;
      margin-bottom: 22px;
    }
    .hero-lead {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .spec-badges {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px solid var(--border-light);
    }
    .spec-badge-item {
      display: flex;
      flex-direction: column;
    }
    .spec-val {
      font-size: 19px;
      font-weight: 700;
      color: var(--primary);
    }
    .spec-lbl {
      font-size: 12px;
      color: var(--text-light);
    }
    .hero-preview-card {
      background-color: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 12px;
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.05);
      position: relative;
    }
    .hero-preview-img {
      border-radius: 4px;
      width: 100%;
      height: 340px;
      object-fit: cover;
    }
    .hero-status-pill {
      position: absolute;
      bottom: 24px;
      left: 24px;
      background: rgba(18, 21, 26, 0.85);
      backdrop-filter: blur(8px);
      color: #FFF;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 13px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .indicator-dot {
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      animation: pulseDot 2s infinite;
    }
    @keyframes pulseDot {
      0% { transform: scale(0.95); opacity: 0.8; }
      50% { transform: scale(1.2); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.8; }
    }

    /* Cards & Grids */
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .ui-card {
      background-color: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 30px 24px;
      transition: var(--transition);
      position: relative;
    }
    .ui-card:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.06);
      border-color: rgba(224, 106, 38, 0.4);
    }
    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 6px;
      background-color: rgba(224, 106, 38, 0.08);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .card-icon svg {
      width: 22px;
      height: 22px;
      fill: currentColor;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 2: Pain Points */
    .pain-card {
      background: #FFF;
      border-left: 4px solid #EF4444;
      padding: 26px;
      border-radius: var(--radius);
      border-top: 1px solid var(--border-light);
      border-right: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }
    .pain-title {
      font-size: 17px;
      font-weight: 700;
      color: #991B1B;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* Section 3: Architecture */
    .arch-container {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-img-wrap {
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
      background: #FFF;
      padding: 8px;
    }
    .arch-level-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .arch-level-item {
      background-color: #FFF;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      border-left: 4px solid var(--accent);
    }
    .arch-level-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }

    /* Section 5: Hardware Spec Comparison */
    .prod-card {
      background-color: #FFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .prod-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px rgba(0, 0, 0, 0.08);
    }
    .prod-header {
      padding: 24px;
      border-bottom: 1px solid var(--border-light);
      background-color: #FAFAFA;
    }
    .prod-body {
      padding: 24px;
      flex-grow: 1;
    }
    .spec-list {
      list-style: none;
      margin-bottom: 24px;
    }
    .spec-list li {
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px dashed rgba(0,0,0,0.06);
      display: flex;
      justify-content: space-between;
    }
    .spec-list li span:first-child {
      color: var(--text-light);
    }
    .spec-list li span:last-child {
      font-weight: 600;
      color: var(--primary);
    }

    /* Section 6: Dark Hardware Inspection */
    .dark-panel-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .dark-box {
      border: 1px solid var(--border-dark);
      background: var(--bg-dark-card);
      border-radius: var(--radius);
      padding: 28px;
    }

    /* Section 7: Process Steps */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-card {
      background: #FFF;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      position: relative;
    }
    .step-num {
      font-size: 32px;
      font-weight: 800;
      color: rgba(224, 106, 38, 0.25);
      line-height: 1;
      margin-bottom: 12px;
    }

    /* Section 8: Metrics Counter */
    .metric-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .metric-item {
      padding: 30px 10px;
      background: #FFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
    }
    .metric-num {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 8px;
      font-family: monospace;
    }
    .metric-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Section 9: Real cases */
    .case-card {
      background: #FFF;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-light);
    }
    .case-card img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }
    .case-card-body {
      padding: 22px;
    }

    /* Section 10: Testimonials */
    .quote-card {
      background: #FFF;
      padding: 28px;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quote-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 20px;
      font-style: italic;
    }
    .author-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E5E7EB;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    /* Section 11: News */
    .news-card {
      background: #FFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
    }
    .news-meta {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 10px;
    }

    /* Section 12: Accordion FAQ */
    .accordion-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .accordion-item {
      background: #FFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .accordion-header {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--primary);
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-header::after {
      content: '+';
      font-size: 20px;
      font-weight: 400;
      color: var(--accent);
      transition: var(--transition);
    }
    .accordion-item.active .accordion-header::after {
      transform: rotate(45deg);
    }
    .accordion-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: #FAFAFA;
      padding: 0 24px;
    }
    .accordion-item.active .accordion-body {
      max-height: 300px;
      padding: 18px 24px;
      border-top: 1px solid var(--border-light);
    }
    .accordion-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* Section 13: Conversion CTA */
    .cta-card {
      background: linear-gradient(135deg, #12151A 0%, #1F242C 100%);
      color: #FFF;
      border-radius: var(--radius);
      padding: 60px 48px;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
      border: 1px solid var(--border-dark);
    }
    .cta-form {
      background: #FFFFFF;
      padding: 30px;
      border-radius: var(--radius);
      color: var(--text-main);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--primary);
    }
    .form-group input, .form-group select {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #D1D5DB;
      border-radius: 4px;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-group input:focus, .form-group select:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(224, 106, 38, 0.15);
    }

    /* Footer */
    .site-footer {
      background-color: #0B0E13;
      color: #9CA3AF;
      padding-top: 72px;
      padding-bottom: 36px;
      font-size: 14px;
      border-top: 1px solid var(--border-dark);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand {
      color: #FFFFFF;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-title {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      padding-top: 30px;
      border-top: 1px solid var(--border-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-grid, .arch-container, .dark-panel-grid, .cta-card {
        grid-template-columns: 1fr;
      }
      .card-grid-4, .step-grid, .metric-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background-color: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .card-grid-3, .card-grid-2 {
        grid-template-columns: 1fr;
      }
      .card-grid-4, .step-grid, .metric-row {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
      }
      .cta-card {
        padding: 32px 20px;
      }
    }